RU2372168C1 - Cutting plate and built-up cutting tool - Google Patents

Abstract

FIELD: mechanical engineering and metal working.

SUBSTANCE: proposed cutting plate has at least one front surface, cutting edge at least one bearing surface to interact with tool casing seat bearing wall representing a polygon or circle and having a center of symmetry, and device to position cutting tool along aforesaid bearing surface and to limit turning about the axis perpendicular to said bearing surface. To simplify machining aforesaid bearing surface, positioning devices represent side surfaces of at least one group of concentric circular grooves with their center off set from axis of symmetry of bearing surface towards its periphery. Proposed cutting tool comprises casing accommodating above described cutting tool. To expand operating performances, casing bearing wall has two groups of concentric circular ledges to interact with mating groups of aforesaid concentric circular grooves. Note that casing seat has additional bearing wall to interact with cutting plate. Note also that main bearing wall is furnished with one group of concentric circular ledges to interact with mating group of concentric circular grooves of cutting plate.

EFFECT: expanded performances.

4 cl, 14 dwg

Description

The invention relates to the field of processing materials by cutting, a prefabricated cutting tool with mechanical fastening of the cutting inserts in the form of a polygon or a circle, in particular in the form of cutters, drills and mills.

Known cutting insert having at least one front surface, a cutting edge, at least one abutment surface, designed to interact with the support wall of the socket of the housing of the prefabricated cutting tool, and made in the form of a polygon or circle, and having a center of symmetry, and means of basing in a direction along said supporting surface and rotation restrictions about an axis perpendicular to the supporting surface (see international application WO 2007/059577, B23B 27/16, 2007) / 1 /.

Known prefabricated cutting tool containing a housing, in the socket of which is mounted on the supporting wall a cutting plate having at least one front surface, a cutting edge, at least one supporting surface, designed to interact with the supporting wall of the socket of the housing of the prefabricated cutting tool, and made in the form of a polygon or a circle, and having a center of symmetry, and basing means in the direction along said supporting surface and restricting rotation about an axis perpendicular to the support hydrochloric surface (see. / 1 /).

The design of the known cutting insert complicates the processing (grinding) of the supporting surface and narrows its technological capabilities and, accordingly, the technological capabilities of the combined cutting tool using this cutting insert.

The objective of the invention is to simplify the processing of the supporting surface of the cutting insert and expanding the technological capabilities of the cutting insert and precast cutting tool. The problem in relation to the cutting insert is solved in that in the cutting insert having at least one front surface, the cutting edge, at least one abutment surface, designed to interact with the abutment wall of the housing of the assembly of the cutting tool, and made in the form of a polygon or a circle, and having a center of symmetry, and basing means in a direction along said supporting surface and restricting rotation about an axis perpendicular to the supporting surface, in accordance with zobreteniem said means basing formed as side surfaces of at least one group of concentric circular grooves, whose center is offset from the center of symmetry of the bearing surface to its periphery.

The task in relation to the cutting insert is also achieved by the fact that it has a through hole for the mounting screw, the axis of which is perpendicular to the supporting surface, or a recess on the front surface, the bottom of which is designed to interact with the gripping of the combined cutting tool.

The task in relation to the cutting insert is also achieved by the fact that it is made mainly in the form of a rectangular parallelepiped with two identical supporting surfaces in the form of a square and lateral surfaces located between them, interconnected by radial cylindrical surfaces, while forming a radius of cylindrical surfaces adjacent to one rib of the parallelepiped, located perpendicular to each other.

The task in relation to the combined cutting tool is achieved by the fact that in the combined cutting tool containing the housing, in the socket of which a cutting plate is fixed on the supporting wall, having at least one front surface, a cutting edge, at least one supporting surface intended for interaction with a support wall of the housing of the assembly of the cutting tool, and made in the form of a polygon or circle, and having a center of symmetry, and basing means in the direction along the said support surface and rotation restrictions relative to the axis perpendicular to the supporting surface, in accordance with the invention, the said means of basing the cutting insert are made in the form of side surfaces of at least one group of concentric annular grooves, the center of which is offset from the center of symmetry of the supporting surface to its periphery, while two groups of concentric annular protrusions are made for the supporting wall of the housing to interact with the corresponding groups of concentric annular grooves of the insert or an additional support wall for interacting with the cutting insert is made in the housing socket, and one group of concentric annular protrusions is made on the main supporting wall for interaction with the corresponding group of concentric annular grooves of the insert.

The proposed precast cutting tool is shown in figures 1-14, in which:

figure 1 presents a front view of a first embodiment of a cutting insert;

figure 2 presents a left view of figure 1;

figure 3 presents a top view of figure 1;

figure 4 presents a section aa in figure 1 and figure 7;

figure 5 presents the cutting insert in figure 1, mounted in a socket of the housing precast cutting tool;

figure 6 presents a section bB in figure 5;

7 is a front view of a second embodiment of a cutting insert;

on Fig presents a left view in Fig.7;

figure 9 presents a top view of figure 7;

figure 10 presents the cutting insert in figure 7, mounted in a socket of the housing of the precast cutting tool;

figure 11 presents a section bb in figure 10;

in Fig.12 presents a section GG in Fig.10;

13 is a front view of a third embodiment of a cutting insert;

on Fig presents a view of D on Fig.

The cutting insert in Fig.1-14 presents three options for its implementation, each of which corresponds to claim 1 of the claims. Moreover, similar elements in these figures are denoted by the same positions.

The cutting insert 1 is made tangential, designed for installation in the socket of the housing 2 precast cutting tool on the rear edge. The cutting insert has front surfaces 3, 4, cutting edges 5, 6 and supporting surfaces 7, 8, designed to alternately interact with the support wall 9 of the housing socket and made in the form of a polygon (see figures 1 and 7) or a circle (see Fig.13). Each abutment surface has a center of symmetry 10.

The cutting insert also has basing means in the direction along said supporting surface and rotation restrictions about an axis perpendicular to the supporting surface, made in the form of at least one group 11 of concentric annular grooves, the center of which is offset from the center of symmetry 10 of the supporting surface to its periphery. In the figures, the groups of concentric grooves are conventionally shown by two concentric circles with a point in the center to which a extension line is drawn from the position number. The cross section of the concentric grooves can be made trapezoidal (see figure 4). The number of grooves in a group can be from 2 to 5, depending on the size of the supporting surface of the cutting insert. The number of concentric groove groups on the insert with polygonal abutment surfaces corresponds to the number of working vertices of the insert. In the cutting insert shown in FIG. 1, this number is four (two groups on each supporting surface), and in the cutting insert shown in FIG. 7, eight (four on each supporting surface).

The means for restricting rotation about an axis perpendicular to the supporting surface in the cutting insert can be made either in the form of an additional group of concentric annular grooves (see FIG. 10), or in the form of a side surface of the cutting insert adjacent to its front surface (see FIG. 5).

In the assembly cutting tool shown in FIG. 5, the cutting insert is fixed in the socket by a screw 12 passing through its central hole 13. Moreover, an additional support wall 14 is made in the housing socket as a means of restricting rotation to interact with said side surface of the cutting insert, and on the main supporting wall there is one group of concentric annular protrusions 15 for interacting with the corresponding group of concentric annular grooves 11 of the insert.

In the prefabricated cutting tool shown in FIG. 10, the cutting insert is secured to the nest by a gripper 16 cooperating with a recess 17 made on each of the four front surfaces of the cutting insert. The gripper 16 is moved using a differential screw 18. On the supporting wall 9 of the housing two groups 15, 19 of concentric annular protrusions are made to interact with the corresponding groups of concentric annular grooves of the insert.

The cutting insert shown in Figs. 7-10 is made in the form of a rectangular parallelepiped with two identical supporting surfaces 7 and 8 in the form of a square and side surfaces located between them, one of which serves as the front surface when the cutting insert is installed in the housing of the assembly of the cutting tool 3. The lateral surfaces are interconnected by radial cylindrical surfaces 20, while the generatrix of the radial cylindrical surfaces adjacent to one edge of the parallelepiped are perp it is dic to each other, which allows to increase the number of working vertices of the cutting insert to eight.

13 and 14 show a third embodiment of a cutting insert having a circular abutment surface 7. The lateral surface of this cutting insert may be conical or cylindrical (not shown). To base and limit the rotation of this plate on the supporting wall of the holder socket, two groups of concentric protrusions are made to interact with two groups of concentric grooves 11 on the supporting surface 7, the total number of which (groups of concentric grooves) corresponds to the number of rotations of the cutting insert in the housing socket when it is dull. The cutting insert shown in FIGS. 13 and 14 has a central hole and is designed to be secured to the housing socket using a fixing screw.

The implementation of the basing means and rotation restrictions in the form of lateral surfaces of concentric annular grooves groups simplifies the processing of grinding the supporting surface of the cutting insert and extends the technological capabilities of the cutting insert and the combined cutting tool using it due to the possibility of installing the cutting insert both along the front and rear faces in the socket Prefabricated cutting tool bodies.

Claims (4)

1. A cutting insert having at least one front surface, a cutting edge, at least one abutment surface, designed to interact with the abutment wall of the housing of a prefabricated cutting tool and made in the form of a polygon or circle and having a center of symmetry, and means of basing in direction along said supporting surface and rotation restrictions with respect to an axis perpendicular to the supporting surface, characterized in that said basing means are made in the form of side turns NOSTA at least one group of concentric circular grooves, whose center is offset from the center of symmetry of the bearing surface to its periphery. 2. The cutting insert according to claim 1, characterized in that it has a through hole for the mounting screw, the axis of which is perpendicular to the supporting surface, or a recess on the front surface, the bottom of which is designed to interact with the gripping of the combined cutting tool. 3. The cutting insert according to claim 1 or 2, characterized in that it is made mainly in the form of a rectangular parallelepiped with two identical supporting surfaces in the form of a square and lateral surfaces located between them, interconnected by radial cylindrical surfaces, while forming a radius cylindrical surfaces adjacent to one edge of the box are perpendicular to each other. 4. A prefabricated cutting tool comprising a housing, in the socket of which a cutting plate is fixed on the supporting wall, having at least one front surface, a cutting edge, at least one supporting surface, designed to interact with the supporting wall of the socket of the housing of the combined cutting tool and made in the form of a polygon or circle and having a center of symmetry, and basing means in a direction along said supporting surface and restricting rotation about an axis perpendicular to the supporting surface surface, characterized in that the said means of basing the cutting insert are made in the form of lateral surfaces of at least one group of concentric annular grooves, the center of which is offset from the center of symmetry of the supporting surface to its periphery, while on the supporting wall of the housing there are two groups of concentric annular protrusions for interacting with the respective groups of concentric annular grooves of the cutting insert or in the housing socket an additional supporting wall is made for interaction with the cutting plate ooze, and the primary support wall is made one group of concentric annular ridges for interacting with a corresponding group of concentric annular grooves of the cutting insert.

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